Sea Dogs on the Loose!

Harbour seals are familiar winter residents of Irving Nature Park’s shores on
the Bay of Fundy. They are known as “sea dogs” because of their
expressive, dog-like faces and barking cry.

During the winter months at low tide, as many as 200
harbour seals (Phoca vitulina) can be seen splashing and diving in the water or
basking in the sun on the rock outcroppings near the park’s observation deck.
Although they live in salt water, harbour seals sometimes swim up the St. John
River searching for food. Seals - like all marine mammals - evolved as
land animals, then returned to the sea, their arms and legs becoming modified
into flippers. Like us, seals are warm-blooded and breathe oxygen.
Adult seals may weigh as much as 113 kilograms and grow to a length of 1.5
metres.

Harbour seals gather
each winter into loosely organized colonies to mate. Usually only a
single pup is born on land to each couple in late spring. Pups remain on
land until they have built up a layer of blubber (fat) to insulate them from
the cold water. Seals wiggle on their bellies awkwardly on land; but they
are excellent swimmers, with bursts of speed up to 15 knots (27 kph)!
They eat fish such as herring and dive for invertebrates on the bottom. A
dive can last as long as 15 minutes before they come up for air. During a
deep dive the seal’s metabolism changes, the heart rate slows dramatically, and
the blood flow to the extremities is cut off to conserve oxygen.

If you walk to Irving Nature Park’s observation deck this
winter, you can watch these lively sea dogs having fun.

About Irving Nature Park
The Irving Nature Park is a 600 acre (243 hectare) site
created by J.D. Irving, Limited to help protect an environmentally significant
area. This special part of the Fundy coastline, minutes from downtown
Saint John, a major urban centre of New Brunswick, is now a place where the
public can enjoy and experience the various ecosystems of the southern New
Brunswick coastline.